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<h1 class="file-heading">File: src\display\Stage.js</h1>

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    <pre class="code prettyprint linenums">
/**
 * 舞台类，最顶层的显示对象，游戏内容的主绘图区。
 * @author Lanfei
 * @class Stage
 * @extends DisplayObject
 *
 * @constructor
 * @param {object} canvas 用于渲染的画布对象
 */
var Stage = go2d.Stage = DisplayObject.extend({
	__init: function(canvas) {
		if (typeof canvas === &#x27;string&#x27;) {
			canvas = document.getElementById(canvas);
		}
		this._super(canvas);
		this.__dispatchEvents();
		this.stage = this;
	},
	__dispatchEvents: function() {
		var timer,
			that = this,
			canvas = this.canvas;

		function createTouchEvent(type, event) {
			var anchor = that.getAnchor(),
				bound = canvas.getBoundingClientRect(),
				scaleX = bound.width / canvas.width,
				scaleY = bound.height / canvas.height,
				localX = (event.pageX - bound.left) / scaleX,
				localY = (event.pageY - bound.top) / scaleY,
				x = localX - anchor.x,
				y = localY - anchor.y,
				identifier = event.identifier || 0;
			return new TouchEvent(type, x, y, localX, localY, x, y, localX, localY, identifier);
		}

		function emitTouch(type, event) {
			var touches = event.changedTouches;
			if (touches) {
				touches = Array.prototype.slice.call(touches);
				forEach(touches, function(event) {
					that.touch(createTouchEvent(type, event));
				});
			} else {
				that.touch(createTouchEvent(type, event));
			}
		}

		if (&#x27;ontouchend&#x27; in document) {
			canvas.addEventListener(&#x27;touchstart&#x27;, function(event) {
				emitTouch(&#x27;touchstart&#x27;, event);
				event.preventDefault();
			});
			canvas.addEventListener(&#x27;touchmove&#x27;, function(event) {
				emitTouch(&#x27;touchmove&#x27;, event);
				event.preventDefault();
			});
			canvas.addEventListener(&#x27;touchend&#x27;, function(event) {
				emitTouch(&#x27;touchend&#x27;, event);
				emitTouch(&#x27;touchtap&#x27;, event);
				event.preventDefault();
			});
			canvas.addEventListener(&#x27;touchcancel&#x27;, function(event) {
				emitTouch(&#x27;touchend&#x27;, event);
				emitTouch(&#x27;touchtap&#x27;, event);
			});
		} else {
			var touched = false;
			canvas.addEventListener(&#x27;mousedown&#x27;, function(event) {
				touched = true;
				emitTouch(&#x27;touchstart&#x27;, event);
			});
			canvas.addEventListener(&#x27;mousemove&#x27;, function(event) {
				if (touched) {
					emitTouch(&#x27;touchmove&#x27;, event);
				}
			});
			canvas.addEventListener(&#x27;mouseup&#x27;, function(event) {
				touched = false;
				emitTouch(&#x27;touchend&#x27;, event);
				emitTouch(&#x27;touchtap&#x27;, event);
			});
		}
	},
	_tick: function(deltaTime) {
		this._super(deltaTime);
		this.render();
	}
});
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